For fully-developed flow in non-circular ducts the [[turbulent length-scale]] can be estimated as <math>0.07 \, d_h</math>. This is as usefull estimation for setting [[turbulence boundary conditions]] for inlets that have fully developed flow.

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For fully-developed flow in non-circular ducts the [[turbulent length scale]] can be estimated as <math>0.07 \, d_h</math>. This is as usefull estimation for setting [[turbulence boundary conditions]] for inlets that have fully developed flow.

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===Computing Reynolds number===

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The hydraulic diamater is often used when computing the dimensionless [[Reynolds number]] for non-circular ducts.

==Hydraulic diameters for different duct-geometries==

==Hydraulic diameters for different duct-geometries==

Latest revision as of 09:58, 17 December 2008

The hydraulic diameter, , is commonly used when dealing with non-circular pipes, holes or ducts.